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(No Model.)

N. H. ,SUREN. SIGNAL BOX. 1m 545,639. Patented Sept. 3,1895.

UNITED STATES PATENT OFFICE.

NATHAN H. SUREN, OF NEW YORK, N. Y., ASSIGNOR TO THE GAMEWELIJFIRE-ALARM TELEGRAPH COMPANY, OF SAME PLACE.

SIGNAL-BOX.

, SPECIFICATION forming part of Letters Patent No. 545,639, datedSeptember 3, 1895.

Application filed March 8, 1895- Serial No. 540,946. (No model.)

To all whom it may concern.-

Be it known that I, NATHAN H. SUREN, a citizen of the United States,residing at New York city, in the county and State of New York, haveinvented a certain new and useful Improvement in Signal-Boxes, of whichthe following is a specification.

The standard fire-alarm-telegraph boxes of the Gardiner type as atpresent made are provided with a cut-out switch, which is operated by astud on the outer door, projecting through a hole in the inner door andengagin g with a spring-plunger which operates the cut-out switch. Suchboxes are also provided with a spring-plunger which mechanicallyrestores the armature of the non-interfering magnet, and this plunger islikewise operated in the inner door of the box. It has been obliqueposition.

found that the cut-out switch is not released sufficiently far inadvance of the non-interfering plunger to insure the passage of currentthrough the non-interfering magnet prior to the release of the armatureof that magnet.

The object of my invention is to overcome this difficulty. This Iaccomplish by increasing the length of the stud on the outer door whichoperates the non-interfering plungerand by making such stud telescopicin construction and providing it with a spring, which tends to keep itprojected, so that as the door of the box is opened the telescopic stud,which is reduced to its shortest length when the door is closed, isextended and holds the non-interfering plunger for a time after thecut-outswitch plunger has been released. My telescopic plunger is alsomounted on a swivel and thrown into an inclined position by a spring, sothat it may properly engagethe hole in the inner door, which, owing toits length, it would not do if not given this In the accompanyingdrawings, forming part hereof, Figure 1 is a View of the signalbox withthe outer door open, and Fig. 2 is a section through the non-interferingstud and the outer door to which it is attached.

A is the outer shell of thefire-alarm-telegraph box, andB is the outerdoor.

0 is the inner door of the box. Through the plungerb for operating thecut-out switch.

The noninterfering devices and cut-out switch are not shown, becausethey are those which are used in the standard Gardiner boxes and arewell understood. A

G is a stud mounted upon the outer door, which enters the hole F in theinner door and bears against the plunger 1) of the cut-out switch. Thestud which engages the noninterfering plunger is composed of a sleeve H,in which is a pin I, which is pressed outwardly by a spiral spring 0,placed in the sleeve. The sleeve H is pivoted on screwpoints It, carriedby a holding-plate K, which is secured to the outer door B. A spring t'is located between the holding-plate K and the end of the sleeve H,close to the surface of the door, and throws the sleeve H and pin I intothe oblique position shown in Fig. 2. By 75 means of this obliqueposition of thenon-interfering stud it will properly enter the hole Ewhen the outer door is closed and engage with the plunger a, and, beingguided by the hole E, will assume a position perpendicular to the dooras the door is closed. The pin I is forced into the sleeve H against thetension of the spring a by the closing of the door B, and as the door Bis opened the pin I is projected outwardly by the spring 0 and holds theplunger a in its inward position until the stud G has entirely clearedthe plunger b and the cut-out switch has been shifted, throwing the boxinto the circuit, and causing the non-interfering magnet to hold itsarmature electrically.

What I claim is- 1. In a signal box, the combination with thenon-interference and cut-out devices of a stud carried on the box door,for operating the cut- 9 5 out devices, and a telescopic spring studcarried on the box door for operating the noninterference devices,substantially as and for the purposes set forth.

2. In a signal box, the combination with the :oo

non-interference and cut-out devices, of a stud carried on the box doorfor operating the cutout devices, and a telescopic spring stud carriedon the box door for operating the noninterference devices, said studhaving an oblique position when the door is open, substantially as andfor the purposes set forth.

3. In a signal box, the combination with the non-interference device, ofa stud carried on the box door for operating such devices, andcomprising the plate K for attachment to the door, the sleeve 11 pivotedto the plate K, the pin 1, spring a and spring '5, substantially as andfor the purposes set forth. it

